Scientists have created the world’s smallest "snowman",_____ about a fifth of the width of a human hair.
The teacher said ____ Tom was an honest boy and ____ he will be our monitor.
It was thought to be ______ adventure for him to walk across ______ Sahara Desert alone.
The teacher was worried about the boys in her class, for they spent ______ time playing computer games.
Luckily, there is a hospital ____ and they soon took the wounded man there.
My son ____ the examination, but he wasn't careful enough.